A part of Northern Africa and Southwestern Asia covered with drought resistant desert plants which is favored by the arid climatic environments. Large areas of desert are gravel-strewn, rocky, or sand-covered instead of having vegetation: one-fourth of the Sahara is covered with sand seas over the rocky or gravel-covered surface. The vegetation cover thickens and becomes denser in uplands because there are higher precipitation totals and lower rates of evaporation. Grassland and woon iodland vegetatin the uplands of North Africa, Lebanon, western Syria, Turkey, and Iran, increase with altitude as the low-to-moderate precipitation become more effective as temperatures and evaporation level decreases. For the most part of the region, soils are poor and undeveloped. The rainy coastal areas and along the valley floors of the rivers have the best soil supplied by the fertile alluvium deposited from annual floods.
Vegetation
A part of Northern Africa and Southwestern Asia covered with drought resistant desert plants which is favored by the arid climatic environments. Large areas of desert are gravel-strewn, rocky, or sand-covered instead of having vegetation: one-fourth of the Sahara is covered with sand seas over the rocky or gravel-covered surface. The vegetation cover thickens and becomes denser in uplands because there are higher precipitation totals and lower rates of evaporation. Grassland and woon iodland vegetatin the uplands of North Africa, Lebanon, western Syria, Turkey, and Iran, increase with altitude as the low-to-moderate precipitation become more effective as temperatures and evaporation level decreases. For the most part of the region, soils are poor and undeveloped. The rainy coastal areas and along the valley floors of the rivers have the best soil supplied by the fertile alluvium deposited from annual floods.